<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./vue-2.5.js"></script>
</head>
<body>
    <div id="app">
        <h1>总数:{{count}}</h1>
        <my-component @add='haldCount' @reduce='haldCount'></my-component>
    </div>
    <script>
        Vue.component('my-component',{
            template:`
            <div>
                <button @click='zAdd'>+1</button>
                <button @click='zReduce'>-1</button>
            </div>
            `,
            data() {
                return {
                    number:0
                }
            },
            methods:{
                zAdd:function() {
                    this.number++,
                    this.$emit('add', this.number);
                },
                zReduce:function() {
                    this.number--,
                    this.$emit('reduce',this.number)
                }
            }
        })

        let app = new Vue({
            el:'#app',
            data() {
                return {
                    count:0
                }
            },
            methods: {
                haldCount:function(consult){
                    this.count = consult
                }
            },
        })
    </script>
</body>
</html>